Fluid measurement
2 May 2014
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Liquid volumes and flow rates can be continuously monitored using sensitive sensors which have recently been added to the George Fischer range of piping systems.
The Type 2270 Ultrasonic Blind Sensor and Type 2260 Ultrasonic Display Sensor have been designed to offer both ease of installation and use, as well as a long low maintenance life, and will find applications in the water, sewage treatment, chemical, manufacturing and processing industries.
They are also suitable for measuring flows in culverts and spillways where flood monitoring is a priority.
The sensors can be used in such roles as for calculating the dosage of chemicals required to control the pH value of a flow, for the accurate filling of storage tanks and in specialist treatments such as electro-plating.
The various sizes and outputs of the 2270 and 2260 models operate on the ‘time of flight’ principle where a sound wave is transmitted from a point above the fluid surface and the time for the return signal to be received measured.
This provides a reading of the level for the surface to an accuracy of +/- 0.2% of flow, with the sophistication of the technology enabling them to allow for wave height or the presence of dust and grease contamination.
The sensors can further recognise and allow for ‘disturbing objects’ such as mixing paddles or ladders mounted on the side of tanks.
The sender unit emits a narrow beam of sound to offer very good echo densities – which can therefore cope with light foaming of the liquid - while the user can also pre-programme in different tank or channel shapes to facilitate the calculation of volumes.
The construction of both units features the choice of polypropylene and PVDF materials for the casings, giving good resistance to aggressive environments and ease of cleaning.
The displays on the 2270 and 2260 are large and easy to read, while they use a 4-20 mA signal strength to communicate with central monitoring devices, HART modem or process control systems.
The 2270 can offer operating ranges of four or six metres while the 2260 encompasses models able to work up to a distance of 15 metres.
Both can be used in proximity of process temperatures between -30 and + 90 degrees centigrade, while all units carry ATEX, CE and RoHs accreditation.
For more information, please contact: uk.ps@georgfischer.com or visit: www.georgefischer.co.uk